travertine

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travertine

(trăv`ərtĭn, –tēn), form of massive calcium carbonate, CaCO3, resulting from deposition by springs or rivers. It is often beautifully colored and banded as a result of the presence of iron compounds or other (e.g., organic) impurities. This material is variously known as calc-sinter and calcareous tufa and (when used for decorative purposes) as onyx marble, Mexican onyx, and Egyptian or Oriental alabaster. Travertine is generally less coarse-grained and takes a higher polish than stalactite and stalagmite, which are similar in chemical composition and origin.

travertine

A variety of limestone deposited by springs, usually banded, commonly coarse and cellular, often containing fossils; used as building stones, especially for interior facing or flooring. See also: Stone

travertine

[′trav·ər‚tēn]
(geology)
Concretionary limestone deposited at the mouth of a hot spring.

travertine

A variety of limestone deposited by springs; usually banded; commonly coarsely cellular; used as building stone, esp. for interior facing and flooring; some varieties are sold as marble in the building trade.